<p>
The plotter view displays the coordinate system and the graphs of your
functions. A function graph has the same color as its corresponding function
tab. You can also point with the mouse over the function graph to display
the name of the function tab and the function equation.
</p>
<p>
<img src="res/plotview.png" alt="Plot View" />
</p>
<h3>Statusbar Information</h3>
<p>
When the mouse cursor is inside the plotter view you can see information
about the coordinates it is pointing at in the status bar. The status bar
consists of 4 cells. The first cell displays the currently selected tab,
the second and third cell display the X- and Y-coordinate of the point under
the mouse cursor. The last cell displays the value that the function of
the selected tab is returning for the displayed X-coordinate. Usually
this is a number, but for some cases it will display -INF, +INF or NAN.
</p>
<p>
-INF and +INF indicate that the function returns a negative or positive 
infinitive value. NAN indicates that the function does not actually return
a number (NAN = Not A Number). This happens for example, when you try
to calculate the square root from a negative number, so the function
<span class="example">sqrt(x)</span> will return NAN for values of x less than
0.
</p>
<h3>Scrolling And Zooming</h3>
<p>
For scrolling hold down the left mouse button in the plotter view and
move the mouse to change the view. You can also use the arrow keys.
Pressing <span class="key">&nbsp;&nbsp;Space&nbsp;&nbsp;</span>
will reset the view to the origin of the coordinate system.
</p>
<p>
A very comfortable way of zooming is using the mouse wheel. If you do not have
a mouse with mouse wheel or you prefer zooming in smaller steps you can also
use the right mouse button:
Hold down the right mouse button in the plotter view and
move the mouse up and down to change the zoom factor. You can also use
<span class="key">+</span> and <span class="key">-</span>.
</p>